/** @module util */
/**
 * 时间格式化
 * @param { * } time 时间
 * @param { String } cFormat 时间格式
 * @return { String } 格式化后的时间
 */
const parseTime = (time, cFormat) => {
  if (arguments.length === 0) {
    return null
  }
  const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
  let date
  if (typeof time === 'object') {
    date = time
  } else {
    if ((typeof time === 'string') && (/^[0-9]+$/.test(time))) {
      if (time.indexOf('-') > 0) {
        time = time.replace(/-/g, '/')
      }
      time = parseInt(time)
    }
    if ((typeof time === 'number') && (time.toString().length === 10)) {
      time = time * 1000
    }
    date = new Date(time)
  }
  const formatObj = {
    y: date.getFullYear(),
    m: date.getMonth() + 1,
    d: date.getDate(),
    h: date.getHours(),
    i: date.getMinutes(),
    s: date.getSeconds(),
    a: date.getDay()
  }
  const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
    let value = formatObj[key]
    // Note: getDay() returns 0 on Sunday
    if (key === 'a') {
      return ['日', '一', '二', '三', '四', '五', '六'][value]
    }
    if (result.length > 0 && value < 10) {
      value = '0' + value
    }
    return value || 0
  })
  return time_str
}


/**
 * 保存图片到本地 
 * @param { String } url 图片路径
 * @return { Promise }
 */
const saveImage = (url) => {
  wx.showLoading({
    title: '保存中',
    mask: true
  })
  return new Promise((resolve, reject) => {
    wx.downloadFile({
      url: url,
      success: function (res) {
        var temp = res.tempFilePath
        wx.saveImageToPhotosAlbum({
          filePath: temp,
          success: function (saveRes) {
            wx.hideLoading()
            wx.showToast({
              title: '保存成功'
            })
            resolve(saveRes)
          },
          fail: function (saveErr) {
            wx.hideLoading()
            wx.showToast({
              title: '保存失败'
            })
            reject(saveErr)
          }
        })
      }
    })
  })
}


module.exports = {
  parseTime: parseTime,
  saveImage: saveImage
}